Actually check alignment in BlobVec test aligned_zst #33455

Job	Run time
ci	2m 4s
build (windows-latest)	6m 20s
miri	6m 33s
toml	6s
build (ubuntu-latest)	2m 17s
build (macos-latest)	6m 14s
check-bevy-internal-imports	5s
check-doc	6m 30s
check-missing-examples-in-docs	42s
run-examples-on-windows-dx12	16m 14s
check-missing-features-in-docs	36s
markdownlint	1m 26s
check-compiles	3m 10s
build-wasm	1m 7s
msrv	59s
	54m 23s

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